window.onload = function () {
    let header = document.querySelector('.header');
    let a = header.querySelector('a');
    window.addEventListener('wheel', (event) => {
        if (window.scrollY >= 100) {
            a.style.transform = 'scale(0.7)';
            a.style.transformOrigin = 'top'
        } else {
            a.style.transform = 'scale(1)';
        }
    })
}